William jackson



(No Model.) 8 l W. JACKSON.

GATE VALVE. l

No. 351,918. ov.' 2,1886.

I f 1 w 1 r s S N `\"%\f! i* A 1H g s N v Wr /////v///// Y WITNESSE I/ UNITED STATES PATENT OFFICE.,

WILLIAMl JACKSON, OE ALLEGHENY CITY, PENNSYLVANIA, ASSIGNOE rroy THE SPECIALTY MANUFACTURING COMPANY, (LIMITEDJOE SAME PLACE.

' GATE-VALVE. A y

SPECIFICATION forming part of Letters Patent No. 351,918, dated November 2, 1886. `Applicationfled March 15, 1886. Serial No. 1552i?. (No model.)

gate, when c1osing,seats itself automatically and rmly. y

The invent-ion consists of the combination, with avalve body or casing havingghiding-re` cesses and lugs at the bottoms of said recesses and a screw-stem seated for rotation in said body or casing, of the two-part gate, consisting of two rings which are provided ontheir inneredges wit-h a double screw-thread-like curve, and each having a lug moving in a recess of the valve body or casing, the nut-ring fitting within said gate-rings and having an angular collar, within which is fitted a nut working upon said screw, whereby, upon the lugs of the valve-rings reaching the lugs at the bottoms of the recesses of the valve body or casing, and by continued movement of the screw or stem, the valve-rings will be revolved apart, and their faces thus packed tightly against their seats, substantially as hereinafter more fully set forth, and pointedout in theclairn.

Reference is to be had to the accompanying drawings, forming a part of this specication,

in which similar letters of reference indicatev corresponding parts in all the figures.

Figure 1 is a central sectional elevation of my improvement. Fig. 2 is a sectional side elevation of the same. Fig. 3 is a sectional plan view of the same, showing the valve closed. Fig. iis a sectional side elevation of the disks, nut-ring, and valve-Stem. Fig. 5 is a sectional plan view on the line x x, Fig. l.

The ordinary gate-valve body,A,is provided on its inner recessed part, A', with the lugs B, placed diametrically opposite each other, one on each side, and with the vertical grooves or guideways C, which commence at the lugs B and run upward. y

` The gate D is made'of two rings, D and D2, which are curved on their inner edgeslike a double screw-thread, each being provided on its side with a lug, E,s\l,id ing in its respective in two parts and flanged on both ends.

groove or guide C on thelvalve-body A. The face D3 of each ringistted accurately over a lcorresponding seat, A2, formed on the -valve- The rings D' f and Dl of the gate D are loosely fitted over body Ain the usual manner.

the nut-ring F, provided on its top with a collar, F', having a square or hexagonal central opening, into which is tted the nut G, cut Into this nut screws the threaded part of the valvestem H, provided with the fixed collar I, and having an annular recess, H', into which are fitted loosely the two halves of a collar or ring,

J, around which is placed another ring, J',`

both rings J and J.' resting on the annular projection A3 of the Valve-body A. The stuffingboX K is screwed down' on the packing be-l tween the rings J J' and stuffing-box K, so

as to hold the rings firmly on the annular projection A3, at the same time allowing theV turning of the valve-stem itself, in the usual Y manner;

lThe operation is as follows: 'Ihe valve is closed by turning the valve-stem H, so that the nut G, the ring F, and the gate D travel downward. The parts D and D2 of the gate D are guided and prevented from turning by means of the lugs E, sliding in theguideways C, formed in the side of the recessed part A' ofthe valve-body A', and in this position they will remain until the valve is securely closed, l

when the ends of the lugs E come in contact with the lugs B, formed ,in therecessed part A' of the valve-body A, so as to force the parts D' and D2 to revolve from each other in opposite directions byl means of their curved inner edges pressing against each other, so as `to firmly press the faces D3 of the gate D on the seats A2 of the valve-body A. In starting to open the valve the lugs E on the sides of the gate D are at once brought against the sides of the guideways C by the turning of the valvestem in the opposite direction to that before described, and thereby revolving the parts D' and D2 toward each other until loosened from the seats A2 of the valve-body. The gate is then free and moves upward with the ring F and the nut G by further turning of the valve.- stem H. Y

Having thus fully described my invention,

IOO

I claim as new and desire to secure by Letters Patent-- The combination, with the valve body or casing having guiding-recesses and lugs at the bottoms of said recesses and a screw-stem seated for rotation in said body or easing, of the two-part gate, consisting of two rings provided on their inner edges with a double serew-tlireadiike curve7 and each having a lug moving in a recess of the valve body or casing, the nut-ring fitting Within said gaterings and having n angular collar, within I lwhich is fitted a nut working upon said screw 

